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STOCK-BASED COMPENSATION PLANS (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 28, 2020
shares
Sep. 01, 2019
$ / shares
shares
Sep. 30, 2019
$ / shares
Dec. 31, 2019
USD ($)
installment
item
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Oct. 10, 2019
$ / shares
Oct. 09, 2019
shares
Dec. 31, 2016
$ / shares
STOCK-BASED COMPENSATION PLANS                  
Number of shares participant is entitled to receive | item       1          
Special dividend per share | $ / shares             $ 9.43    
Restricted Stock Units | Key employees                  
STOCK-BASED COMPENSATION PLANS                  
Shares granted 70,400                
Vesting period 4 years                
Restricted Stock Units | Non employee directors                  
STOCK-BASED COMPENSATION PLANS                  
Shares granted 2,750                
Stock Appreciation Rights                  
STOCK-BASED COMPENSATION PLANS                  
Granted (in units)       110,160          
Granted (in dollars per unit) | $ / shares       $ 16.32          
Stock appreciation rights plan liability recorded for the outstanding units | $       $ 409 $ 1,884        
Compensation expense (benefit) | $       343 540 $ 291      
Unrecognized compensation cost related to non-vested stock-based compensation agreements | $       140 0        
Stock appreciation rights plan liability recorded for the previously exercised units | $       $ 1,512 $ 176        
Number of equal annual instalments in which the liability recorded for previously exercised units will be paid | installment       5          
Outstanding (in dollars per unit) | $ / shares       $ 16.32 $ 5.73 $ 5.66     $ 5.66
Special dividend per share | $ / shares   $ 9.43              
Stock Appreciation Rights | Key employees                  
STOCK-BASED COMPENSATION PLANS                  
Granted (in units)   110,160              
Granted (in dollars per unit) | $ / shares   $ 25.75 $ 16.32            
Fully vested on grant date   79,560              
Vest ratable (in units)   30,600              
Vesting period   4 years              
Omnibus Incentive Plan                  
STOCK-BASED COMPENSATION PLANS                  
Authorized number of shares               1,820,000